When a lively girl from a pastry shop in a small town in Lin'an met a cold-faced prince who came to investigate the case. She respects him like the moon in the sky, but he despises her like the dust on the ground. An assassination, a rescue, two people who should not have crossed paths were forced to live in the same room. He was moved but didn't know it, and she was deeply in love but was disgusted. When she finally learned his true identity, she boldly proposed to the emperor for marriage, but she didn't know that this high-profile marriage would be the beginning of her purgatory... It wasn't until the anti-child medicine was discovered and the position of concubine was given to someone else. She handed over the divorce letter with despair, and she was shocked to realize that they had already been deeply in love with him. But when she really left, he understood what it meant to regret.